After seeing Collision make some highly questionable claims in this thread and then vacate the thread entirely rather than defend or explain those claims when several people called him on it I'm not very inclined to take what he says at face value.

Mastery is better than haste until you have a bunch of RPPM procs. Everyone claiming otherwise is misappropriating a post from before PTR changes were even finished, with an Arms sim that hadn't been optimized, that was using best in slot T15 heroic gear. It's completely irrelevant for months.

My assumptions on this is Mastery will beat Haste in overall dps value until you can utilize Haste more with RPPM trinkets and the legendary meta, which I wouldn't start going all out haste till you have at least two, if not all three and maybe 2piece tier.

Currently for me haste and mastery are like 0.05 apart from each other, with mastery pulling slightly ahead.
I imagine haste overtaking mastery in the near future, after getting a hold of a RPPM trinket or two and/or the legendary meta.

After seeing Collision make some highly questionable claims in this thread and then vacate the thread entirely rather than defend or explain those claims when several people called him on it I'm not very inclined to take what he says at face value.

>_>

I honestly don't check the MMO-C forums enough to keep up with that type of debate. Especially when all the dude has to do is comment out that specific line in simcraft, to see that it's a dps loss to remove it. Plus, my action list has been implemented into the default simcraft action list: